For \(B \rightarrow K^* \tau ^+ \tau ^-\)  decay, the di-tauon \(q^2\)  ranges from 15 \(\rm GeV^2\)  to 19.2 \(\rm GeV^2\) . Within this region, the form-factors are computed using a combined fit to lattice and LCSR results. The predictions of the branching ratio, \(f_L\) , \(A_{FB}\) , optimized angular observables \(P_{1,2,3}\)  & \(P^{\prime }_{4,5,6,8}\)  in \(B \rightarrow K^* \tau ^+ \tau ^-\)  decay along with the LFU ratio \(R^{\tau \mu }_{K^*}\)  are obtained using flavio [1]}. We obtained the prediction of other LFU ratios defined above along with the difference observables \(Q^{\tau \mu }\)  by implementing them in flavio using the corresponding pre-defined \(\tau \)  and \(\mu \)  observables.
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